var keyword in C#

In C#, the var keyword is used for implicit type declaration.

When you declare a variable with var, the compiler infers the type based on the value assigned to it at compile time.
The type is fixed after compilation, it’s not dynamic.
The variable must be initialized at the time of declaration.

Syntax:

var variable_name = value;

Example 1:

csharp

using System;
using System.Text;

class GFG {

    static void Main(string[] args)
    {
        var a = 637;
        var b = -9721087085262;

        // to print their type of variables
        Console.WriteLine("value of a {0}, type {1}", a, a.GetType());
        Console.WriteLine("value of b {0}, type {1}", b, b.GetType());
    }
}

Output

value of a 637, type System.Int32
value of b -9721087085262, type System.Int64

Example 2:

csharp

using System;
using System.Text;

namespace Test {

class GFG {

    static void Main(string[] args)
    {
        var c = 120.23f;
        var d = 150.23m;
        var e = 'G';
        var f = "Geeks";

        // to print their type of variables
        Console.WriteLine("value of c {0}, type {1}", c, c.GetType());
        Console.WriteLine("value of d {0}, type {1}", d, d.GetType());
        Console.WriteLine("value of e {0}, type {1}", e, e.GetType());
        Console.WriteLine("value of f {0}, type {1}", f, f.GetType());

        Console.ReadLine();
    }
}
}

Output

value of c 120.23, type System.Single
value of d 150.23, type System.Decimal
value of e G, type System.Char
value of f Geeks, type System.String

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